[chbot] How to disable hyperthreading

Tue May 21 09:29:48 BST 2019

Urro,


Unless you're running a multi-tenant hypervisor or server facing the
'net without a 2nd gen firewall in front these side channel attacks are
extremely unlikely to be an issue.  If you spent the money on a
hyperthreading CPU chucking away 40% of your performance due to a
vulnerability with no current demonstrated exploit you might also be
interested in some tinfoil hats, and the left-handed long waits they
sell at Blackwells.  :-)


On 21/05/19 20:01, Bevin Brett wrote:
> You have to do it before the operating system is running,
> so you turn the machine off, and during the startup hold down a
> manufacturer-specific key
> to get into the bios menus
>
> Here is an old but good article..
>
> https://www.pcmag.com/article/314585/how-to-disable-hyperthreading 
>
> Don't forget to do the os and bios upgrades as well - just disabling
> hyperthreading is only part of the fix - and not one that is needed on
> AMD chips, I believe.
>
> /Bevin
>
>
> ------------------------------------------------------------------------
> *From:* Chchrobotics <chchrobotics-bounces at lists.ourshack.com> on
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> *Subject:* Chchrobotics Digest, Vol 140, Issue 7
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> Today's Topics:
>
>    1. Robotics Group meeting, Monday 20 May 2019, 630pm, 5 Idris
>       Road (Mark Atherton)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 20 May 2019 21:42:28 +1200
> From: Mark Atherton <markaren1 at xtra.co.nz>
> To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
> Subject: [chbot] Robotics Group meeting, Monday 20 May 2019, 630pm, 5
>         Idris Road
> Message-ID: <5c222566-c2ac-961d-8f8c-fa5700328510 at xtra.co.nz>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hello everyone,
>
> Quite a few new faces this evening; welcome.
>
> Enthusiastic turnout with 23 attendees, and lots of huddles-of
> tech-talk. $43 + change (in gold, and flat-money) collected and
> transferred into the robotics loose-change jar (for later banking).
>
> Quick reminder: equipment donations are welcome for the trading table,
> but no CRT based product, printers, toner or items that are likely to be
> a disposal burden. All sales from the trading table should go into the
> brown box on the wall, and are directly for the benefit of our host
> club, NZART Branch 05.
>
> With thanks on behalf of the group,
>
> Mark Atherton
>
> PS thank you Trevor for locking up.
>
> ============
>
> William brought in a 3D optical waveguide seven-segment display, based
> entirely on cardboard, LED strips, and hot glue. Quite a clever piece of
> lateral thinking, and fabrication.
>
> Peter brought in his 300V, 3kW modular power supply system (following on
> from the email reflector discussion).
>
> Kerry brought in some ancient-semiconductors, including a 1954 germanium
> device, and one of the first samples of a silicon RF power device.
>
> Bevin started off with quite a stunning description of the latest Intel
> cache-bug. He also brought along some more items from his mechanical
> calculator collection. This month, we were treated to some insight about
> the workings of a 1928 vintage Monroe calculator, as well as a tiny
> Curta hand-held 1957 rotary calculator.
>
> David B talked about his latest purchase – a low cost laser cutter. He
> discussed some of the pitfalls, fixes and upgrades to make the machine a
> little more respectable.
>
> Robin G talked about the latest generation, V low cost component tester
> product.
>
> Volker talked about his latest investigation into Very Low Cost
> Chinese-sourced LED lighting, and associated power supplies. He also
> gave us an update on his coffee-maker project.
>
>
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
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> End of Chchrobotics Digest, Vol 140, Issue 7
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